Features: Equipped with 2 lead wires, easy for wiring(convenient for testing car, motorcycle, and battery cart);No extra power needed;High precision voltage meter, DC 2.5V-30V measuring range;With reverse wiring protection and fine adjustment function; Specifications: Type: digital voltage meterMeasuring range: 2.4V-30.0VVoltage measurement error: 0.05VWorking current: <30 mADisplay mode: 0.36 LEDRefresh rate: about 100ms/timeLine length: 20cm/7.87 Display color: redOperating temperature: -10 ~ 65Product size: 35 x 20 x 20mm/1.38 x 0.79 x 0.79 Mounting hole size: 32 x 21 mm / 1.26 x 0.83 Notes: When the voltage is below 3V, the display brightness will darken while not affecting the correct measurement.Testing voltage higher than 30V may damage the product.